+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   91P/Russell 3 Classification: Jupiter-family Comet          SPK-ID: 1000074 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2008-Aug-24.0] K203/9 (default) [epoch=2005-Jan-10.0] K135/1 [epoch=1997-Nov-08.0] SAO/1997 [epoch=1990-May-29.0] SAO/1990 [epoch=1982-Nov-07.0] SAO/1982 Orbital Elements at Epoch 2454702.5 (2008-Aug-24.0) TDB Reference: JPL K203/9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3300667330034073 2.303e-07   a 3.890928150631438 2.3154e-07 au q 2.60666220760153 9.7429e-07 au i 14.09112981309247 1.9457e-05 deg node 247.8983368232365 6.605e-05 deg peri 354.881178691618 9.5384e-05 deg M 148.1936237575201 4.4039e-05 deg tp 2453548.501455958272 (2005-Jun-27.00145596) 0.00029022 TDB period 2803.355942862829 7.68 0.00025023 6.851e-07 d yr n .1284175136291693 1.1463e-08 deg/d Q 5.175194093661346 3.0796e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -1.087100297314223E-7 4.034E-9 A2 [EST] 1.976424003113985E-9 7.553E-11 A3 [EST] 8.530645011240852E-9 1.866E-9   Orbit Determination Parameters    # obs. used (total)      248      data-arc span      5912 days (16.19 yr)      first obs. used      2004-03-18      last obs. used      2020-05-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .89975      source      ORB      producer      Shantanu Naidu      solution date      2020-Jul-09 15:48:48   Additional Information  Earth MOID = 1.59449 au   Jupiter MOID = .0842916 au   T_jup = 2.921  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 7.3   0.8 K203/9 from 81 observations, assumed slope, autocmod 2.8 comet total magnitude slope K1 23.   n/a K203/9 autocmod 2.8 comet nuclear magnitude M2 15.6   01. K203/9 from 138 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a K203/9 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a K203/9 autocmod 2.8 91P/Russell 3          Discovered 1983-Jun-14 by Russell, Kenneth S. at U. K. Schmidt Telescope Unit, Siding Spring discovered on plate/photo taken on discovery date as well as 6/15 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1990.1   91P/1989 A4   1990 VII   1989d   1982.5   91P/1983 L1   1982 IX   1983i  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 09:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin